Search

Besides cyclist and pedestrian, motorcyclist also is vulnerable road users (VRU) because of lack of safety factors. Considering the traffic situation at present of developing countries which represent the number of motorbikes, the dangerous traffic accidents regarding motorcyclist always higher than others. Particularly, motorbike, which main vehicle in Vietnam, combine with the increase of the number of cars has created many problems about the crash between car and motorcyclist and the level of user's injury. Hence, the main aim of this study is that researching how car crashes influence Vietnamese human body in a traffic accidence, in particular, human head because it is the most important part in the whole body. Human Body Model is Dummy Hybrid III, but it is scaled down to average size of Vietnamese male named V-Dummy while the finite element car models used in this research are already published. Furthermore, motorbike finite element model is completely built in new. Then, V-Dummy is changed the posture from pedestrian to driver on motorbike to conduct the crash simulation model in different cases (velocity and impact angle) via LS-Dyna software. The results are taken out via LS- prepost and processed to predict easier the head injury of motorcyclist. Based on the databases, the dummy head was frequently hit by the car's windshield during the primary impact and the HIC show the acceleration of the head corresponds to the speed of impactor. At 0° of impact angle, the motorcyclist suffers higher HIC than 30o of impact angle. The velocity of motorbike does not cause a significant effect at low velocities from 20 km/h to 40 km/h while there is a considerable higher HIC at 50 km/h of car's velocity when motorcyclist go at 30 km/h of velocity instead of 0 km/h of velocity. [ABSTRACT FROM AUTHOR]

Wearing helmets while riding motorcycles is compulsory in Vietnam since 2007. The goal of this study is to build finite element models of two of the most common type of helmet to be worn by Vietnamese. Based-on observation, half helmet makes up the majority followed by open face helmet. The viability of the two helmet is studied using finite element method. The open face helmet and the half helmet was designed by the Solidwork CAD tool and modeled by LS- Prepost with different thickness of the impact absorbing liner. Among with the modified V-dummy, these helmets have been conducted drop test following the European helmet standard ECE R22.05 at four impact position. The result has pointed out that the helmet models created a significant decrease of multiple injury index comparing with non-helmet model. Nevertheless, even with a thicker liner, the half helmet failed more tests than the open face helmet due to ECE 22-05. Moreover, the study also points out that traditional helmets have limited effect on rotational-based brain injury. [ABSTRACT FROM AUTHOR]